The Role of Moldic Porosity in Paleozoic Kansas Reservoirs and the Association of Original Depositional Facies and Early Diagenesis With Reservoir Properties

Kansas Geological Survey
Open-file Report 2003-32

Interpreted Regional Depositional Setting and Controls

Recent studies place the Kansas study area during Osagean-Meramecian time in a subtropical-tropical location, at about 20 degrees S.

A number of biotic and non-biotic associations indicate co-existence of warm and colder water. Presence of evaporites indicates arid conditions. However, the dominance of a heterozoan association (light-independent organisms such as echinoderms, siliceous sponge spicules, bryozoans) and the lack of a photozoan association (few light dependent organisms/skeletons, rare ooids and peloids) points to nutrient-rich cool water conditions.

Based on the subtropical-tropical setting and regional paleogeography, ramp characteristics during Osagean-Meramecian deposition are interpreted to result from upwelling of nutrient-rich colder waters from the Ouachita basin up onto the shelf.

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Last updated May 2003